MxToolBox is described as 'All of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool. Input a domain name or IP Address or Host Name. Links in the results will guide you to other relevant tools and information' and is a Uptime Monitor service in the network & admin category. There are more than 50 alternatives to MxToolBox, not only websites but also apps for a variety of platforms, including SaaS, Windows, Linux and Self-Hosted apps. The best MxToolBox alternative is Domain Digger, which is both free and Open Source. Other great sites and apps similar to MxToolBox are Pingdom, HetrixTools, MailAegis and Klaxel.
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InboxGreen checks whether your emails reach the inbox or land in spam. Test SPF, DKIM and DMARC authentication records for any domain instantly, no account required.
Relaymetry is a free checker for email authentication and domain posture. Enter any domain and it inspects MX, SPF (expanding includes to show the real DNS-lookup count against the 10-lookup limit), DKIM, DMARC, MTA-STS, TLS-RPT, BIMI, DNSBL blacklists, and TLS, then reports the...
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